Defensive publication

ABSTRACT

DEVELOPMENT OF A LATENT IMAGE IN AN EXPOSED, PHOTOGRAPHIC SILVER HALIDE EMULSION LAYER IS PROVIDED BY CONTACT OF THE EMULSION LAYER WITH A METAL WHICH IS MAGNESIUM, CADMIUM, ZINC OR IRON IN THE PRESENCE OF WATER AND AS SILVER HALIDE DEVELOPING AGENT, WHILE IN THE ABSENCE OF A SEQUESTERING AGENT. THE SILVER HALIDE DEVELOPING AGENT IS INCORPORATED IN THE EMULSION LAYER OR A LAYER CONTIGUOUS TO THE EMULSION LAYER.

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16. 1969, 869 O.G. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Oflice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED JUNE 1, 1971 T887,0ll5 DEVELOPMENT OF PHOTOGRAPI-HC MATERIALS Edward C. Yackel, Kodak Park Division, Rochester, N.Y. 14650 Filed Nov. 16, 1970, Ser. No. 90,026 Int. Cl. G03c 5/26 U.S. CI. 96-63 No Drawing. 12 Pages Specification Development of a latent image in an exposed, photographic silver halide emulsion layer is provided by contact of the emulsion layer with a metal which is magnesium, cadmium, zinc or iron in the presence of water and a silver halide developing agent, while in the absence of a sequestering agent. The silver halide developing agent is incorporated in the emulsion layer or a layer contiguous to the emulsion layer. 

